Heat Pump Frozen Outside

An iced-over outdoor unit keeps shedding capacity the longer it runs that way, so it deserves a call before it stops making heat entirely.

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When this becomes an emergency

The outdoor cabinet is buried in solid ice instead of light frost.
Indoor supply air has gone lukewarm even with the system running.
The outdoor fan blade is striking ice as it tries to turn.
A ridge of ice has grown around the base and is not clearing between cycles.

What a pro does

Frost during a defrost cycle is expected behavior, and a solid shell is not. The likely faults are a defrost control that has stopped commanding the cycle, a refrigerant charge that has drifted low, or a fan slowed enough to stop moving air across the coil, and blowing snow that packs into an exposed cabinet on an open lot makes all three worse. A technician watches whether normal defrost clears the coil and how fast ice returns afterward, because that timing separates weather from a failed component. Chipping at the ice bends fins, so that's a second problem nobody needs.

Frequently asked questions

Is some ice on a heat pump normal in winter?

A light coating that clears itself during defrost is normal operation, not a fault.

Does wind-driven snow make this worse?

It does. Fine snow packs into the coil face on an exposed site, and a coil that cannot breathe ices over well ahead of a sheltered one.

Should the system be shut down while iced?

Switching it off and letting the coil thaw is reasonable, since running a heavily iced unit strains the compressor for very little heat in return.

Does a heat pump still work at these temperatures?

Capacity falls as it gets colder, which is why most installations up here pair the heat pump with a backup heat source rather than relying on it alone.

Heat Pump Frozen Outside?

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